Question

If two electric bulbs one of $200V-40W$ and other of $200V-100W$ are connected in a domestic circuit, then

• A. They have equal resistance
• B. The resistance of $100W$ bulb is more than $40W$ bulb
• C. They have equal current passing through them
• D. The resistance of $40W$ bulb is more than $100W$ bulb

Answer 1

The correct option is D The resistance of $40W$ bulb is more than $100W$ bulb


Here, due to domestic circuit potential difference will be equal.
$P=\frac{V^2}{R}P\propto \frac{1}{R}$
so, a bulb having high power will have less resistance.

Hence, option D is correct.